[Bug 16417] New: Zaphod crash and framebuffer confusion

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=16417

           Summary: Zaphod crash and framebuffer confusion
           Product: xorg
           Version: git
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: werner at openmoko.org
         QAContact: xorg-team at lists.x.org


Created an attachment (id=17215)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=17215)
X output (with extra debugging) of a crashed session

When trying to set up a Zaphod configuration (:0.0 from an nVidia GeForce
7300 SE, :0.1 and :0.2 from an ATI RV610. The monitors are all Samsung
206NW, with analog input.), I get a crash in
radeon_atombios.c:CailReadATIRegister because info->MMIO is NULL.
(Example session with some extra debugging output is attached.)

After commenting out all but the initial info->MMIO = NULL assignments
in radeon_driver.c, X comes up, but there seems to be some confusion
about where the pixel data for each screen comes from.

By the way, the info->MMIO = NULL after RADEONUnmapMMIO in
radeon_driver.c:RADEONPreInit seem to be redundant.

The scenario I get when the X server comes up is as follows: :0.0 is
on the nVidia card and works as expected. The other two screens also
display an image, but only :0.1 has the expected content. :0.2 shows
black and grey horizontal stripes, each perhaps about 8 pixels high,
overlaid with some color noise.

When trying to display anything on :0.2, nothing shows, but the command
is accepted. So X seems to think that there's a perfectly good :0.2.
:0.2 responds to xrandr, I just can't get it to display anything.

Further investigation reveals that the driver selected DVI-0 for :0.1
and VGA-0 for :0.2, and that both access the same monitor.

All this is with git revision eed241553748125e902c44dcc8cf8e0605be071b.

Any suggestions ?

Thanks,
- Werner


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